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52 lines
1.6 KiB
C
52 lines
1.6 KiB
C
/* Copyright (C) 1991-2013 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <string.h>
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static char tmpnam_buffer[L_tmpnam];
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/* Generate a unique filename in P_tmpdir.
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This function is *not* thread safe! */
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char *
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tmpnam (char *s)
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{
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/* By using two buffers we manage to be thread safe in the case
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where S != NULL. */
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char tmpbufmem[L_tmpnam];
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char *tmpbuf = s ?: tmpbufmem;
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/* In the following call we use the buffer pointed to by S if
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non-NULL although we don't know the size. But we limit the size
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to L_tmpnam characters in any case. */
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if (__builtin_expect (__path_search (tmpbuf, L_tmpnam, NULL, NULL, 0),
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0))
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return NULL;
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if (__builtin_expect (__gen_tempname (tmpbuf, 0, 0, __GT_NOCREATE), 0))
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return NULL;
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if (s == NULL)
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return (char *) memcpy (tmpnam_buffer, tmpbuf, L_tmpnam);
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return s;
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}
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link_warning (tmpnam,
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"the use of `tmpnam' is dangerous, better use `mkstemp'")
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